Phosphorescent materials are enhancing and broadening the usefulness of organic compounds in a wide variety of applications. They increase organic light emitting diode efficiencies three-to-four fold, enhance organic photovoltaics, and provide unique sensitivity for chemical and cancer detection. Unfortunately, metal-free organics are intrinsically incapable of efficient phosphorescence, which restricts these fields to a relatively limited family of organometallics when designing new materials.
Researchers at University of Michigan have developed a series of pure organic phosphorescence compounds that are not emissive in solution but are emissive in liquid nitrogen. Also, when the organic phosphorescence compounds are mixed with similarly structured analogous organic crystal they produce 70% quantum yield in the solid- state at room temperature. When the crystal melts the emission disappears as well. Recrystallization of the melt brings the emission back. The pure analogous crystal matrix itself also has phosphorescence emission in liquid nitrogen but not at room temperature neither in solution. Several similar molecules with identical phenomena but different colors have also been developed by altering the chemical structure of the compounds.
Applications and Advantages
- Solid-state lightning devices
- Flexible display fabrication
- Highly sensitive fluorescent sensor
- Organic laser and TFT
- Photo-bleach free
- High quantum yield